Re: [R] Backslash in sub pattern?

From: Marc Schwartz <marc_schwartz_at_comcast.net>
Date: Mon, 14 Jul 2008 13:23:34 -0500

on 07/14/2008 01:09 PM Stephan Kolassa wrote:
> Dear guRus,
>
> I am trying to replace "~" by "$\sim$" for TeX. However, I can't get the
> backslash to work. I would like to turn "DV~IV" into "DV$\sim$IV".
>
> sub("~","$\sim$","DV~IV") => "DV$sim$IV"
> sub("~","$\\sim$","DV~IV") => "DV$sim$IV"
> sub("~","$\\\sim$","DV~IV") => "DV$sim$IV"
> sub("~","$\\\\sim$","DV~IV") => "DV$\\sim$IV"

>
> Alternatives 1 and 3 also yield warnings about unknown escape sequences
> (no surprise there). I have been unsuccessfully searching the archives.
> sessionInfo below.

>
> Thank you all for your time!

>
> Best regards
> Stephan

You want door number 4 because when the double escape is cat()'d to the .tex file, you get:

 > cat("DV$\\sim$IV", "\n")
DV$\sim$IV

which is what you want latex to process.

HTH, Marc Schwartz



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